/************************************************************************/
/*! \class RtAudio
    \brief Realtime audio i/o C++ classes.

    RtAudio provides a common API (Application Programming Interface)
    for realtime audio input/output across Linux (native ALSA, Jack,
    and OSS), SGI, Macintosh OS X (CoreAudio and Jack), and Windows
    (DirectSound and ASIO) operating systems.

    RtAudio WWW site: http://www.music.mcgill.ca/~gary/rtaudio/

    RtAudio: realtime audio i/o C++ classes
    Copyright (c) 2001-2008 Gary P. Scavone

    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation files
    (the "Software"), to deal in the Software without restriction,
    including without limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to do so,
    subject to the following conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    Any person wishing to distribute modifications to the Software is
    asked to send the modifications to the original developer so that
    they can be incorporated into the canonical version.  This is,
    however, not a binding provision of this license.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
/************************************************************************/

/*!
   \file RtAudio.h
 */

// RtAudio: Version 4.0.4

#ifndef __RTAUDIO_H
#define __RTAUDIO_H

#include <string>
#include <vector>
#include "RtError4.h"

namespace RtAudio4
{

    /*! \typedef typedef unsigned long RtAudioFormat;
        \brief RtAudio data format type.

        Support for signed integers and floats.  Audio data fed to/from an
        RtAudio stream is assumed to ALWAYS be in host byte order.  The
        internal routines will automatically take care of any necessary
        byte-swapping between the host format and the soundcard.  Thus,
        endian-ness is not a concern in the following format definitions.

        - \e RTAUDIO_SINT8:   8-bit signed integer.
        - \e RTAUDIO_SINT16:  16-bit signed integer.
        - \e RTAUDIO_SINT24:  Upper 3 bytes of 32-bit signed integer.
        - \e RTAUDIO_SINT32:  32-bit signed integer.
        - \e RTAUDIO_FLOAT32: Normalized between plus/minus 1.0.
        - \e RTAUDIO_FLOAT64: Normalized between plus/minus 1.0.
     */
    typedef unsigned long RtAudioFormat;
    static const RtAudioFormat RTAUDIO_SINT8 = 0x1; // 8-bit signed integer.
    static const RtAudioFormat RTAUDIO_SINT16 = 0x2; // 16-bit signed integer.
    static const RtAudioFormat RTAUDIO_SINT24 = 0x4; // Lower 3 bytes of 32-bit signed integer.
    static const RtAudioFormat RTAUDIO_SINT32 = 0x8; // 32-bit signed integer.
    static const RtAudioFormat RTAUDIO_FLOAT32 = 0x10; // Normalized between plus/minus 1.0.
    static const RtAudioFormat RTAUDIO_FLOAT64 = 0x20; // Normalized between plus/minus 1.0.

    /*! \typedef typedef unsigned long RtAudioStreamFlags;
        \brief RtAudio stream option flags.

        The following flags can be OR'ed together to allow a client to
        make changes to the default stream behavior:

        - \e RTAUDIO_NONINTERLEAVED:   Use non-interleaved buffers (default = interleaved).
        - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
        - \e RTAUDIO_HOG_DEVICE:       Attempt grab device for exclusive use.

        By default, RtAudio streams pass and receive audio data from the
        client in an interleaved format.  By passing the
        RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
        data will instead be presented in non-interleaved buffers.  In
        this case, each buffer argument in the RtAudioCallback function
        will point to a single array of data, with \c nFrames samples for
        each channel concatenated back-to-back.  For example, the first
        sample of data for the second channel would be located at index \c
        nFrames (assuming the \c buffer pointer was recast to the correct
        data type for the stream).

        Certain audio APIs offer a number of parameters that influence the
        I/O latency of a stream.  By default, RtAudio will attempt to set
        these parameters internally for robust (glitch-free) performance
        (though some APIs, like Windows Direct Sound, make this difficult).
        By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
        function, internal stream settings will be influenced in an attempt
        to minimize stream latency, though possibly at the expense of stream
        performance.

        If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
        open the input and/or output stream device(s) for exclusive use.
        Note that this is not possible with all supported audio APIs.
     */
    typedef unsigned int RtAudioStreamFlags;
    static const RtAudioStreamFlags RTAUDIO_NONINTERLEAVED = 0x1; // Use non-interleaved buffers (default = interleaved).
    static const RtAudioStreamFlags RTAUDIO_MINIMIZE_LATENCY = 0x2; // Attempt to set stream parameters for lowest possible latency.
    static const RtAudioStreamFlags RTAUDIO_HOG_DEVICE = 0x4;    // Attempt grab device and prevent use by others.

    /*! \typedef typedef unsigned long RtAudioStreamStatus;
        \brief RtAudio stream status (over- or underflow) flags.

        Notification of a stream over- or underflow is indicated by a
        non-zero stream \c status argument in the RtAudioCallback function.
        The stream status can be one of the following two options,
        depending on whether the stream is open for output and/or input:

        - \e RTAUDIO_INPUT_OVERFLOW:   Input data was discarded because of an overflow condition at the driver.
        - \e RTAUDIO_OUTPUT_UNDERFLOW: The output buffer ran low, likely producing a break in the output sound.
     */
    typedef unsigned int RtAudioStreamStatus;
    static const RtAudioStreamStatus RTAUDIO_INPUT_OVERFLOW = 0x1; // Input data was discarded because of an overflow condition at the driver.
    static const RtAudioStreamStatus RTAUDIO_OUTPUT_UNDERFLOW = 0x2; // The output buffer ran low, likely causing a gap in the output sound.

    //! RtAudio callback function prototype.
    /*!
       All RtAudio clients must create a function of type RtAudioCallback
       to read and/or write data from/to the audio stream.  When the
       underlying audio system is ready for new input or output data, this
       function will be invoked.

       \param outputBuffer For output (or duplex) streams, the client
              should write \c nFrames of audio sample frames into this
              buffer.  This argument should be recast to the datatype
              specified when the stream was opened.  For input-only
              streams, this argument will be NULL.

       \param inputBuffer For input (or duplex) streams, this buffer will
              hold \c nFrames of input audio sample frames.  This
              argument should be recast to the datatype specified when the
              stream was opened.  For output-only streams, this argument
              will be NULL.

       \param nFrames The number of sample frames of input or output
              data in the buffers.  The actual buffer size in bytes is
              dependent on the data type and number of channels in use.

       \param streamTime The number of seconds that have elapsed since the
              stream was started.

       \param status If non-zero, this argument indicates a data overflow
              or underflow condition for the stream.  The particular
              condition can be determined by comparison with the
              RtAudioStreamStatus flags.

       \param userData A pointer to optional data provided by the client
              when opening the stream (default = NULL).

       To continue normal stream operation, the RtAudioCallback function
       should return a value of zero.  To stop the stream and drain the
       output buffer, the function should return a value of one.  To abort
       the stream immediately, the client should return a value of two.
     */
    typedef int (*RtAudioCallback)(void* outputBuffer, void* inputBuffer,
                                   unsigned int nFrames,
                                   double streamTime,
                                   RtAudioStreamStatus status,
                                   void* userData);


    // **************************************************************** //
    //
    // RtAudio class declaration.
    //
    // RtAudio is a "controller" used to select an available audio i/o
    // interface.  It presents a common API for the user to call but all
    // functionality is implemented by the class RtApi and its
    // subclasses.  RtAudio creates an instance of an RtApi subclass
    // based on the user's API choice.  If no choice is made, RtAudio
    // attempts to make a "logical" API selection.
    //
    // **************************************************************** //

    class RtApi;

    class RtAudio
    {
        public:
            //! Audio API specifier arguments.
            enum Api
            {
                UNSPECIFIED, /*!< Search for a working compiled API. */
                LINUX_ALSA, /*!< The Advanced Linux Sound Architecture API. */
                LINUX_OSS, /*!< The Linux Open Sound System API. */
                UNIX_JACK, /*!< The Jack Low-Latency Audio Server API. */
                MACOSX_CORE, /*!< Macintosh OS-X Core Audio API. */
                WINDOWS_ASIO, /*!< The Steinberg Audio Stream I/O API. */
                WINDOWS_DS, /*!< The Microsoft Direct Sound API. */
                RTAUDIO_DUMMY /*!< A compilable but non-functional API. */
            };

            //! The public device information structure for returning queried values.
            struct DeviceInfo
            {
                bool probed;      /*!< true if the device capabilities were successfully probed. */
                std::string name; /*!< Character string device identifier. */
                unsigned int outputChannels; /*!< Maximum output channels supported by device. */
                unsigned int inputChannels; /*!< Maximum input channels supported by device. */
                unsigned int duplexChannels; /*!< Maximum simultaneous input/output channels supported by device. */
                bool isDefaultOutput; /*!< true if this is the default output device. */
                bool isDefaultInput; /*!< true if this is the default input device. */
                std::vector<unsigned int>sampleRates; /*!< Supported sample rates (queried from list of standard rates). */
                RtAudioFormat nativeFormats; /*!< Bit mask of supported data formats. */

                // Default constructor.
                DeviceInfo ()
                    : probed(false), outputChannels(0), inputChannels(0), duplexChannels(0),
                      isDefaultOutput(false), isDefaultInput(false), nativeFormats(0) {
                }
            };

            //! The structure for specifying input or ouput stream parameters.
            struct StreamParameters
            {
                unsigned int deviceId; /*!< Device index (0 to getDeviceCount() - 1). */
                unsigned int nChannels; /*!< Number of channels. */
                unsigned int firstChannel; /*!< First channel index on device (default = 0). */

                // Default constructor.
                StreamParameters ()
                    : deviceId(0), nChannels(0), firstChannel(0) {
                }
            };

            //! The structure for specifying stream options.
            /*!
               The following flags can be OR'ed together to allow a client to
               make changes to the default stream behavior:

               - \e RTAUDIO_NONINTERLEAVED:   Use non-interleaved buffers (default = interleaved).
               - \e RTAUDIO_MINIMIZE_LATENCY: Attempt to set stream parameters for lowest possible latency.
               - \e RTAUDIO_HOG_DEVICE:       Attempt grab device for exclusive use.

               By default, RtAudio streams pass and receive audio data from the
               client in an interleaved format.  By passing the
               RTAUDIO_NONINTERLEAVED flag to the openStream() function, audio
               data will instead be presented in non-interleaved buffers.  In
               this case, each buffer argument in the RtAudioCallback function
               will point to a single array of data, with \c nFrames samples for
               each channel concatenated back-to-back.  For example, the first
               sample of data for the second channel would be located at index \c
               nFrames (assuming the \c buffer pointer was recast to the correct
               data type for the stream).

               Certain audio APIs offer a number of parameters that influence the
               I/O latency of a stream.  By default, RtAudio will attempt to set
               these parameters internally for robust (glitch-free) performance
               (though some APIs, like Windows Direct Sound, make this difficult).
               By passing the RTAUDIO_MINIMIZE_LATENCY flag to the openStream()
               function, internal stream settings will be influenced in an attempt
               to minimize stream latency, though possibly at the expense of stream
               performance.

               If the RTAUDIO_HOG_DEVICE flag is set, RtAudio will attempt to
               open the input and/or output stream device(s) for exclusive use.
               Note that this is not possible with all supported audio APIs.

               The \c numberOfBuffers parameter can be used to control stream
               latency in the Windows DirectSound, Linux OSS, and Linux Alsa APIs
               only.  A value of two is usually the smallest allowed.  Larger
               numbers can potentially result in more robust stream performance,
               though likely at the cost of stream latency.  The value set by the
               user is replaced during execution of the RtAudio::openStream()
               function by the value actually used by the system.

               The \c streamName parameter can be used to set the client name
               when using the Jack API.  By default, the client name is set to
               RtApiJack.  However, if you wish to create multiple instances of
               RtAudio with Jack, each instance must have a unique client name.
             */
            struct StreamOptions
            {
                RtAudioStreamFlags flags; /*!< A bit-mask of stream flags (RTAUDIO_NONINTERLEAVED, RTAUDIO_MINIMIZE_LATENCY, RTAUDIO_HOG_DEVICE). */
                unsigned int numberOfBuffers; /*!< Number of stream buffers. */
                std::string streamName; /*!< A stream name (currently used only in Jack). */

                // Default constructor.
                StreamOptions ()
                    : flags(0), numberOfBuffers(0) {
                }
            };

            //! A static function to determine the available compiled audio APIs.
            /*!
               The values returned in the std::vector can be compared against
               the enumerated list values.  Note that there can be more than one
               API compiled for certain operating systems.
             */
            static void getCompiledApi(std::vector<Api>& apis) throw ();

            //! The class constructor.
            /*!
               The constructor performs minor initialization tasks.  No exceptions
               can be thrown.

               If no API argument is specified and multiple API support has been
               compiled, the default order of use is JACK, ALSA, OSS (Linux
               systems) and ASIO, DS (Windows systems).
             */
            RtAudio (Api api = UNSPECIFIED) throw ();

            //! The destructor.
            /*!
               If a stream is running or open, it will be stopped and closed
               automatically.
             */
            ~RtAudio () throw ();

            //! Returns the audio API specifier for the current instance of RtAudio.
            RtAudio::Api getCurrentApi(void) throw ();

            //! A public function that queries for the number of audio devices available.
            /*!
               This function performs a system query of available devices each time it
               is called, thus supporting devices connected \e after instantiation. If
               a system error occurs during processing, a warning will be issued.
             */
            unsigned int getDeviceCount(void) throw ();

            //! Return an RtAudio::DeviceInfo structure for a specified device number.
            /*!

               Any device integer between 0 and getDeviceCount() - 1 is valid.
               If an invalid argument is provided, an RtError (type = INVALID_USE)
               will be thrown.  If a device is busy or otherwise unavailable, the
               structure member "probed" will have a value of "false" and all
               other members are undefined.  If the specified device is the
               current default input or output device, the corresponding
               "isDefault" member will have a value of "true".
             */
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);

            //! A function that returns the index of the default output device.
            /*!
               If the underlying audio API does not provide a "default
               device", or if no devices are available, the return value will be
               0.  Note that this is a valid device identifier and it is the
               client's responsibility to verify that a device is available
               before attempting to open a stream.
             */
            unsigned int getDefaultOutputDevice(void) throw ();

            //! A function that returns the index of the default input device.
            /*!
               If the underlying audio API does not provide a "default
               device", or if no devices are available, the return value will be
               0.  Note that this is a valid device identifier and it is the
               client's responsibility to verify that a device is available
               before attempting to open a stream.
             */
            unsigned int getDefaultInputDevice(void) throw ();

            //! A public function for opening a stream with the specified parameters.
            /*!
               An RtError (type = SYSTEM_ERROR) is thrown if a stream cannot be
               opened with the specified parameters or an error occurs during
               processing.  An RtError (type = INVALID_USE) is thrown if any
               invalid device ID or channel number parameters are specified.

               \param outputParameters Specifies output stream parameters to use
                     when opening a stream, including a device ID, number of channels,
                     and starting channel number.  For input-only streams, this
                     argument should be NULL.  The device ID is an index value between
                     0 and getDeviceCount() - 1.
               \param inputParameters Specifies input stream parameters to use
                     when opening a stream, including a device ID, number of channels,
                     and starting channel number.  For output-only streams, this
                     argument should be NULL.  The device ID is an index value between
                     0 and getDeviceCount() - 1.
               \param format An RtAudioFormat specifying the desired sample data format.
               \param sampleRate The desired sample rate (sample frames per second).
               \param *bufferFrames A pointer to a value indicating the desired
                     internal buffer size in sample frames.  The actual value
                     used by the device is returned via the same pointer.  A
                     value of zero can be specified, in which case the lowest
                     allowable value is determined.
               \param callback A client-defined function that will be invoked
                     when input data is available and/or output data is needed.
               \param userData An optional pointer to data that can be accessed
                     from within the callback function.
               \param options An optional pointer to a structure containing various
                     global stream options, including a list of OR'ed RtAudioStreamFlags
                     and a suggested number of stream buffers that can be used to
                     control stream latency.  More buffers typically result in more
                     robust performance, though at a cost of greater latency.  If a
                     value of zero is specified, a system-specific median value is
                     chosen.  If the RTAUDIO_MINIMIZE_LATENCY flag bit is set, the
                     lowest allowable value is used.  The actual value used is
                     returned via the structure argument.  The parameter is API dependent.
             */
            void openStream(RtAudio::StreamParameters* outputParameters,
                            RtAudio::StreamParameters* inputParameters,
                            RtAudioFormat format, unsigned int sampleRate,
                            unsigned int* bufferFrames, RtAudioCallback callback,
                            void* userData = NULL, RtAudio::StreamOptions* options = NULL);

            //! A function that closes a stream and frees any associated stream memory.
            /*!
               If a stream is not open, this function issues a warning and
               returns (no exception is thrown).
             */
            void closeStream(void) throw ();

            //! A function that starts a stream.
            /*!
               An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
               during processing.  An RtError (type = INVALID_USE) is thrown if a
               stream is not open.  A warning is issued if the stream is already
               running.
             */
            void startStream(void);

            //! Stop a stream, allowing any samples remaining in the output queue to be played.
            /*!
               An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
               during processing.  An RtError (type = INVALID_USE) is thrown if a
               stream is not open.  A warning is issued if the stream is already
               stopped.
             */
            void stopStream(void);

            //! Stop a stream, discarding any samples remaining in the input/output queue.
            /*!
               An RtError (type = SYSTEM_ERROR) is thrown if an error occurs
               during processing.  An RtError (type = INVALID_USE) is thrown if a
               stream is not open.  A warning is issued if the stream is already
               stopped.
             */
            void abortStream(void);

            //! Returns true if a stream is open and false if not.
            bool isStreamOpen(void) throw ();

            //! Returns true if the stream is running and false if it is stopped or not open.
            bool isStreamRunning(void) throw ();

            //! Returns the number of elapsed seconds since the stream was started.
            /*!
               If a stream is not open, an RtError (type = INVALID_USE) will be thrown.
             */
            double getStreamTime(void);

            //! Returns the internal stream latency in sample frames.
            /*!
               The stream latency refers to delay in audio input and/or output
               caused by internal buffering by the audio system and/or hardware.
               For duplex streams, the returned value will represent the sum of
               the input and output latencies.  If a stream is not open, an
               RtError (type = INVALID_USE) will be thrown.  If the API does not
               report latency, the return value will be zero.
             */
            long getStreamLatency(void);

            //! Specify whether warning messages should be printed to stderr.
            void showWarnings(bool value = true) throw ();
        protected:
            void openRtApi(RtAudio::Api api);
            RtApi* rtapi_;
    };

};

// Operating system dependent thread functionality.
#if defined (__WINDOWS_DS__) || defined (__WINDOWS_ASIO__)
    #include <windows.h>
    #include <process.h>

namespace RtAudio4
{
    typedef unsigned long ThreadHandle;
    typedef CRITICAL_SECTION StreamMutex;
};

#elif defined (__LINUX_ALSA__) || defined (__UNIX_JACK__) || defined (__LINUX_OSS__) || defined (__MACOSX_CORE__)
// Using pthread library for various flavors of unix.
    #include <pthread.h>

namespace RtAudio4
{
    typedef pthread_t ThreadHandle;
    typedef pthread_mutex_t StreamMutex;
};

#else // Setup for "dummy" behavior

namespace RtAudio4
{
    #define __RTAUDIO_DUMMY__
    typedef int ThreadHandle;
    typedef int StreamMutex;
};

#endif

namespace RtAudio4
{
    // This global structure type is used to pass callback information
    // between the private RtAudio stream structure and global callback
    // handling functions.
    struct CallbackInfo
    {
        void* object; // Used as a "this" pointer.
        ThreadHandle thread;
        void* callback;
        void* userData;
        void* apiInfo; // void pointer for API specific callback information
        bool isRunning;

        // Default constructor.
        CallbackInfo ()
            : object(0), callback(0), userData(0), apiInfo(0), isRunning(false) {
        }
    };

};

// **************************************************************** //
//
// RtApi class declaration.
//
// Subclasses of RtApi contain all API- and OS-specific code necessary
// to fully implement the RtAudio API.
//
// Note that RtApi is an abstract base class and cannot be
// explicitly instantiated.  The class RtAudio will create an
// instance of an RtApi subclass (RtApiOss, RtApiAlsa,
// RtApiJack, RtApiCore, RtApiAl, RtApiDs, or RtApiAsio).
//
// **************************************************************** //

#if defined (HAVE_GETTIMEOFDAY)
    #include <sys/time.h>
#endif

#include <sstream>

namespace RtAudio4
{

    class RtApi
    {
        public:
            RtApi ();
            virtual ~RtApi ();
            virtual RtAudio::Api getCurrentApi(void) = 0;
            virtual unsigned int getDeviceCount(void) = 0;
            virtual RtAudio::DeviceInfo getDeviceInfo(unsigned int device) = 0;
            virtual unsigned int getDefaultInputDevice(void);
            virtual unsigned int getDefaultOutputDevice(void);
            void openStream(RtAudio::StreamParameters* outputParameters,
                            RtAudio::StreamParameters* inputParameters,
                            RtAudioFormat format, unsigned int sampleRate,
                            unsigned int* bufferFrames, RtAudioCallback callback,
                            void* userData, RtAudio::StreamOptions* options);
            virtual void closeStream(void);
            virtual void startStream(void) = 0;
            virtual void stopStream(void) = 0;
            virtual void abortStream(void) = 0;
            long getStreamLatency(void);
            virtual double getStreamTime(void);
            bool isStreamOpen(void) {
                return stream_.state != STREAM_CLOSED;
            };
            bool isStreamRunning(void) {
                return stream_.state == STREAM_RUNNING;
            };
            void showWarnings(bool value) {
                showWarnings_ = value;
            };
        protected:
            static const unsigned int MAX_SAMPLE_RATES;
            static const unsigned int SAMPLE_RATES[];

            enum { FAILURE, SUCCESS };

            enum StreamState
            {
                STREAM_STOPPED,
                STREAM_RUNNING,
                STREAM_CLOSED = -50
            };

            enum StreamMode
            {
                OUTPUT,
                INPUT,
                DUPLEX,
                UNINITIALIZED = -75
            };

            // A protected structure used for buffer conversion.
            struct ConvertInfo
            {
                int channels;
                int inJump, outJump;
                RtAudioFormat inFormat, outFormat;
                std::vector<int>inOffset;
                std::vector<int>outOffset;
            };

            // A protected structure for audio streams.
            struct RtApiStream
            {
                unsigned int device[2]; // Playback and record, respectively.
                void* apiHandle; // void pointer for API specific stream handle information
                StreamMode mode; // OUTPUT, INPUT, or DUPLEX.
                StreamState state; // STOPPED, RUNNING, or CLOSED
                char* userBuffer[2]; // Playback and record, respectively.
                char* deviceBuffer;
                bool doConvertBuffer[2]; // Playback and record, respectively.
                bool userInterleaved;
                bool deviceInterleaved[2]; // Playback and record, respectively.
                bool doByteSwap[2]; // Playback and record, respectively.
                unsigned int sampleRate;
                unsigned int bufferSize;
                unsigned int nBuffers;
                unsigned int nUserChannels[2]; // Playback and record, respectively.
                unsigned int nDeviceChannels[2]; // Playback and record channels, respectively.
                unsigned int channelOffset[2]; // Playback and record, respectively.
                unsigned long latency[2]; // Playback and record, respectively.
                RtAudioFormat userFormat;
                RtAudioFormat deviceFormat[2]; // Playback and record, respectively.
                StreamMutex mutex;
                CallbackInfo callbackInfo;
                ConvertInfo convertInfo[2];
                double streamTime; // Number of elapsed seconds since the stream started.

                #if defined (HAVE_GETTIMEOFDAY)
                struct timeval lastTickTimestamp;
                #endif

                RtApiStream ()
                    : apiHandle(0), deviceBuffer(0) {
                    device[0] = 11111; device[1] = 11111;
                }
            };

            typedef signed short Int16;
            typedef signed int Int32;
            typedef float Float32;
            typedef double Float64;

            std::ostringstream errorStream_;
            std::string errorText_;
            bool showWarnings_;
            RtApiStream stream_;

            /*!
               Protected, api-specific method that attempts to open a device
               with the given parameters.  This function MUST be implemented by
               all subclasses.  If an error is encountered during the probe, a
               "warning" message is reported and FAILURE is returned. A
               successful probe is indicated by a return value of SUCCESS.
             */
            virtual bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                         unsigned int firstChannel, unsigned int sampleRate,
                                         RtAudioFormat format, unsigned int* bufferSize,
                                         RtAudio::StreamOptions* options);

            //! A protected function used to increment the stream time.
            void tickStreamTime(void);

            //! Protected common method to clear an RtApiStream structure.
            void clearStreamInfo();

            /*!
               Protected common method that throws an RtError (type =
               INVALID_USE) if a stream is not open.
             */
            void verifyStream(void);

            //! Protected common error method to allow global control over error handling.
            void error(RtError::Type type);

            /*!
               Protected method used to perform format, channel number, and/or interleaving
               conversions between the user and device buffers.
             */
            void convertBuffer(char* outBuffer, char* inBuffer, ConvertInfo& info);

            //! Protected common method used to perform byte-swapping on buffers.
            void byteSwapBuffer(char* buffer, unsigned int samples, RtAudioFormat format);

            //! Protected common method that returns the number of bytes for a given format.
            unsigned int formatBytes(RtAudioFormat format);

            //! Protected common method that sets up the parameters for buffer conversion.
            void setConvertInfo(StreamMode mode, unsigned int firstChannel);
    };

    // **************************************************************** //
    //
    // Inline RtAudio definitions.
    //
    // **************************************************************** //

    inline RtAudio::Api RtAudio::getCurrentApi(void) throw () {
        return rtapi_->getCurrentApi();
    }
    inline unsigned int RtAudio::getDeviceCount(void) throw () {
        return rtapi_->getDeviceCount();
    }
    inline RtAudio::DeviceInfo RtAudio::getDeviceInfo(unsigned int device) {
        return rtapi_->getDeviceInfo(device);
    }
    inline unsigned int RtAudio::getDefaultInputDevice(void) throw () {
        return rtapi_->getDefaultInputDevice();
    }
    inline unsigned int RtAudio::getDefaultOutputDevice(void) throw () {
        return rtapi_->getDefaultOutputDevice();
    }
    inline void RtAudio::closeStream(void) throw () {
        rtapi_->closeStream();
    }
    inline void RtAudio::startStream(void) {
        rtapi_->startStream();
    }
    inline void RtAudio::stopStream(void) {
        rtapi_->stopStream();
    }
    inline void RtAudio::abortStream(void) {
        rtapi_->abortStream();
    }
    inline bool RtAudio::isStreamOpen(void) throw () {
        return rtapi_->isStreamOpen();
    }
    inline bool RtAudio::isStreamRunning(void) throw () {
        return rtapi_->isStreamRunning();
    }
    inline long RtAudio::getStreamLatency(void) {
        return rtapi_->getStreamLatency();
    }
    inline double RtAudio::getStreamTime(void) {
        return rtapi_->getStreamTime();
    }
    inline void RtAudio::showWarnings(bool value) throw () {
        rtapi_->showWarnings(value);
    }

};

// RtApi Subclass prototypes.

#if defined (__MACOSX_CORE__)

    #include <CoreAudio/AudioHardware.h>

namespace RtAudio4
{

    class RtApiCore : public RtApi
    {
        public:
            RtApiCore ();
            ~RtApiCore ();
            RtAudio::Api getCurrentApi(void) {
                return RtAudio::MACOSX_CORE;
            };
            unsigned int getDeviceCount(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            unsigned int getDefaultOutputDevice(void);
            unsigned int getDefaultInputDevice(void);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);
            long getStreamLatency(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            bool callbackEvent(AudioDeviceID deviceId,
                               const AudioBufferList* inBufferList,
                               const AudioBufferList* outBufferList);
        private:
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
            static const char * getErrorCode(OSStatus code);
    };

};

#endif

#if defined (__UNIX_JACK__)

namespace RtAudio4
{

    class RtApiJack : public RtApi
    {
        public:
            RtApiJack ();
            ~RtApiJack ();
            RtAudio::Api getCurrentApi(void) {
                return RtAudio::UNIX_JACK;
            };
            unsigned int getDeviceCount(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);
            long getStreamLatency(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            bool callbackEvent(unsigned long nframes);
        private:
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
    };

};

#endif

#if defined (__WINDOWS_ASIO__)

namespace RtAudio4
{

    class RtApiAsio : public RtApi
    {
        public:
            RtApiAsio ();
            ~RtApiAsio ();
            RtAudio::Api getCurrentApi(void) {
                return RtAudio::WINDOWS_ASIO;
            };
            unsigned int getDeviceCount(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);
            long getStreamLatency(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            bool callbackEvent(long bufferIndex);
        private:
            std::vector<RtAudio::DeviceInfo>devices_;
            void saveDeviceInfo(void);
            bool coInitialized_;
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
    };

};

#endif

#if defined (__WINDOWS_DS__)

namespace RtAudio4
{

    class RtApiDs : public RtApi
    {
        public:
            RtApiDs ();
            ~RtApiDs ();
            RtAudio::Api getCurrentApi(void) {
                return RtAudio::WINDOWS_DS;
            };
            unsigned int getDeviceCount(void);
            unsigned int getDefaultOutputDevice(void);
            unsigned int getDefaultInputDevice(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);
            long getStreamLatency(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            void callbackEvent(void);
        private:
            bool coInitialized_;
            bool buffersRolling;
            long duplexPrerollBytes;
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
    };

};

#endif

#if defined (__LINUX_ALSA__)

namespace RtAudio4
{

    class RtApiAlsa : public RtApi
    {
        public:
            RtApiAlsa ();
            ~RtApiAlsa ();
            RtAudio::Api getCurrentApi() {
                return RtAudio::LINUX_ALSA;
            };
            unsigned int getDeviceCount(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            void callbackEvent(void);
        private:
            std::vector<RtAudio::DeviceInfo>devices_;
            void saveDeviceInfo(void);
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
    };

};

#endif

#if defined (__LINUX_OSS__)

namespace RtAudio4
{

    class RtApiOss : public RtApi
    {
        public:
            RtApiOss ();
            ~RtApiOss ();
            RtAudio::Api getCurrentApi() {
                return RtAudio::LINUX_OSS;
            };
            unsigned int getDeviceCount(void);
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device);
            void closeStream(void);
            void startStream(void);
            void stopStream(void);
            void abortStream(void);

            // This function is intended for internal use only.  It must be
            // public because it is called by the internal callback handler,
            // which is not a member of RtAudio.  External use of this function
            // will most likely produce highly undesireable results!
            void callbackEvent(void);
        private:
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options);
    };

};

#endif

#if defined (__RTAUDIO_DUMMY__)

namespace RtAudio4
{

    class RtApiDummy : public RtApi
    {
        public:
            RtApiDummy () {
                errorText_ = "RtApiDummy: This class provides no functionality."; error(RtError::WARNING);
            };
            RtAudio::Api getCurrentApi(void) {
                return RtAudio::RTAUDIO_DUMMY;
            };
            unsigned int getDeviceCount(void) {
                return 0;
            };
            RtAudio::DeviceInfo getDeviceInfo(unsigned int device) {
                RtAudio::DeviceInfo info; return info;
            };
            void closeStream(void) {
            };
            void startStream(void) {
            };
            void stopStream(void) {
            };
            void abortStream(void) {
            };
        private:
            bool probeDeviceOpen(unsigned int device, StreamMode mode, unsigned int channels,
                                 unsigned int firstChannel, unsigned int sampleRate,
                                 RtAudioFormat format, unsigned int* bufferSize,
                                 RtAudio::StreamOptions* options) {
                return false;
            };
    };

};

#endif

#endif

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